I'm analyzing this sentence and scanning it for prepositional, appositive and verbal phrases. In the sentence so far as I can tell there is only one prepositional and no appositive and no verbals (infinitive, gerund, participial). However, a few things do confuse me.
He is immortal, not because he alone among creatures has an inexhaustible voice but because he has a soul, a spirit capable of compassion and sacrifice and endurance.
From what I can tell, the 'among creatures' is a prepositional phrase with 'among' being the preposition. No appositives, but I feel like a sentence like this with such an interesting structure should have more than just a single prepositional phrase.
Am I missing something here? What other phrases exist here?